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Solution Overview
Problem
Conventional air conditioner scrolls with round bell mouths suffer from unstable suction flow due to uneven pressure distribution, leading to degraded blowing efficiency of sirocco fans.
Innovation Solution
The design incorporates a scroll body with a bell mouth in a two-step structure and specific geometric ratios for the sirocco fan, including a pair of rings and blades with varying angles and dimensions, to optimize air flow and pressure distribution, ensuring 0.76≤D/H≤0.8, 0.13≤Sv/Sh≤0.15, and 0.7≤V2/V1≤0.75, and blade shapes with a step structure to enhance blowing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional round bell mouth is used, then the structure is simple and easy to manufacture, but the pressure distribution becomes uneven causing unstable suction flow and degraded blowing efficiency
Solution Approach 1:
The bell mouth is divided into multiple sections: a first bell mouth section with a first curvature radius and a second bell mouth section with a second curvature radius. This segmentation allows different portions of the air inlet to have different geometric characteristics, optimizing both pressure distribution and manufacturability.
Solution Approach 2:
Different sections of the bell mouth are given different local geometric properties. The first bell mouth section has a larger curvature radius to reduce flow resistance at the inlet, while the second bell mouth section has a smaller curvature radius to control pressure distribution. This local differentiation resolves the contradiction between simple structure and optimal performance.
2Productivity
If the bell mouth curvature is increased to reduce flow resistance, then air intake improves, but pressure distribution becomes more uneven degrading suction flow stability
Solution Approach 1:
The bell mouth is segmented into two sections with different curvature radii. The first section (larger curvature) handles the inlet region to minimize flow resistance and maximize air intake, while the second section (smaller curvature) manages the transition region to maintain pressure distribution and suction flow stability.
Solution Approach 2:
The bell mouth structure implements local quality by assigning different curvature characteristics to different regions. The inlet region has optimized curvature for air intake, while the transition region has adjusted curvature for flow stability, resolving the contradiction between these two requirements.
3Productivity
If the sirocco fan diameter is increased to improve blowing efficiency, then air discharge improves, but the scroll body height must increase which is not feasible in ceiling-mounted applications
Solution Approach 1:
The patent optimizes the ratio relationship between the sirocco fan outer diameter (D) and scroll body height (H), establishing that 0.76 ≤ D/H ≤ 0.8. This parameter optimization allows maximum blowing efficiency within constrained height dimensions suitable for ceiling-mounted air conditioners.
Solution Approach 2:
Instead of increasing fan diameter alone, the patent optimizes the dimensional relationship between fan diameter and scroll height, utilizing the ratio parameter to achieve optimal performance within the constrained height dimension required for ceiling installation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration stabilizes air flow, increases blowing efficiency, reduces noise, and decreases power consumption, resulting in improved performance and efficiency of the sirocco fan.
Implementation Method 1
there is great difference in pressure distribution due to the shape of the bell mouth 110. Accordingly, the suction flow is unstable due to the difference in the pressure distribution
Implementation Method 2
When the sirocco fan rotates, the sirocco fan generates a pressure change to form a flow field
Implementation Method 3
The scroll changes dynamic pressure of the air discharged from the sirocco fan into static pressure, thereby increasing the static pressure at the outlet
Data Source
AI summary
An air conditioner includes a scroll body comprising an inlet through which air is introduced, an outlet through which the air is discharged, and an air passage between the inlet and the outlet, a sirocco fan rotatably disposed in the scroll body, the sirocco fan configured to allow the air to be sucked through the inlet and to be discharged through the outlet when the sirocco fan rotates, and a bell mouth formed around the inlet of the scroll body, wherein the scroll body and the sirocco fan satisfy a following formula: 0.76≤H/D≤0.8,where H (mm) is a height of the scroll body, and D (mm) is an outer diameter of the sirocco fan.